Skipping Savage weekly floors without forfeiting rewards from the previous floor

[Isutowaru]

let the loot penalty (of not having chests) apply only to me if I choose to do previous fights.

This is something that's *kinda* already in the game. You can't reopen a chest for a fight you cleared for the week if its a 1 chest group but it shouldn't be too hard to remove the chest penalty for the group.
That said, doing 1 through 4 sucks and there's already trolls joining and leaving.